com.singularsys.extensions.field.implementations

Class StringField

java.lang.Object

com.singularsys.extensions.field.implementations.AbstractComparativeField

com.singularsys.extensions.field.implementations.StringField

All Implemented Interfaces:

FieldI, java.io.Serializable

public final class StringField
extends AbstractComparativeField

String concatenation, and comparison

Author:

Richard Morris

See Also:

Serialized Form

Constructor Summary

Constructors

Constructor and Description
StringField()

Method Summary

Modifier and Type	Method and Description
java.lang.Object	add(java.lang.Object l, java.lang.Object r) Add two members of the field.
java.lang.Boolean	and(java.lang.Object l, java.lang.Object r) Not implemented for this field.
java.lang.Integer	cmp(java.lang.Object l, java.lang.Object r) Uses String.compareTo(String)
java.lang.Object	div(java.lang.Object l, java.lang.Object r) Not implemented for this field.
java.lang.Object	getOne() Not defined for this field
java.lang.Object	getZero() Not defined for this field
java.lang.Object	mod(java.lang.Object l, java.lang.Object r) Not implemented for this field.
java.lang.Object	mul(java.lang.Object l, java.lang.Object r) Not implemented for this field.
java.lang.Object	neg(java.lang.Object l) The negation -x of an element.
java.lang.Boolean	not(java.lang.Object l) Not implemented for this field.
java.lang.Boolean	or(java.lang.Object l, java.lang.Object r) Not implemented for this field.
java.lang.Object	pow(java.lang.Object l, java.lang.Object r) Not implemented for this field.
java.lang.Object	sub(java.lang.Object l, java.lang.Object r) Subtract two members of the field.

Methods inherited from class com.singularsys.extensions.field.implementations.AbstractComparativeField

eq, ge, gt, le, lt, ne

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

StringField

public StringField()

Method Detail

add

public java.lang.Object add(java.lang.Object l,
                            java.lang.Object r)
                     throws EvaluationException

Description copied from interface: FieldI

Add two members of the field.

Parameters:

l - left hand argument

r - right hand argument

Returns:

an object representing the result or null if it can not be evaluated.

Throws:

EvaluationException - on error

sub

public java.lang.Object sub(java.lang.Object l,
                            java.lang.Object r)
                     throws EvaluationException

Description copied from interface: FieldI

Subtract two members of the field.

Parameters:

l - left hand argument

r - right hand argument

Returns:

null always

Throws:

EvaluationException - on error

neg

public java.lang.Object neg(java.lang.Object l)
                     throws EvaluationException

Description copied from interface: FieldI

The negation -x of an element.

Parameters:

l - the argument

Returns:

null always

Throws:

EvaluationException - on error

cmp

public java.lang.Integer cmp(java.lang.Object l,
                             java.lang.Object r)
                      throws EvaluationException

Uses String.compareTo(String)

Specified by:

cmp in class AbstractComparativeField

Returns:

-1, 0, 1 if l < r, l==r or l > r respectively, or null if comparison cannot be carried out or

Throws:

EvaluationException

mul

public java.lang.Object mul(java.lang.Object l,
                            java.lang.Object r)
                     throws EvaluationException

Not implemented for this field.

Parameters:

l - left hand argument

r - right hand argument

Returns:

null

Throws:

EvaluationException - on error

div

public java.lang.Object div(java.lang.Object l,
                            java.lang.Object r)
                     throws EvaluationException

Not implemented for this field.

Parameters:

l - left hand argument

r - right hand argument

Returns:

null

Throws:

EvaluationException - on error

mod

public java.lang.Object mod(java.lang.Object l,
                            java.lang.Object r)
                     throws EvaluationException

Not implemented for this field.

Parameters:

l - left hand argument

r - right hand argument

Returns:

null

Throws:

EvaluationException - on error

pow

public java.lang.Object pow(java.lang.Object l,
                            java.lang.Object r)
                     throws EvaluationException

Not implemented for this field.

Parameters:

l - left hand argument

r - right hand argument

Returns:

null

Throws:

EvaluationException - on error

and

public java.lang.Boolean and(java.lang.Object l,
                             java.lang.Object r)
                      throws EvaluationException

Not implemented for this field.

Parameters:

l - left hand argument implimentation

r - right hand argument

Returns:

null

Throws:

EvaluationException - on error

or

public java.lang.Boolean or(java.lang.Object l,
                            java.lang.Object r)
                     throws EvaluationException

Not implemented for this field.

Parameters:

l - left hand argument

r - right hand argument

Returns:

null

Throws:

EvaluationException - on error

not

public java.lang.Boolean not(java.lang.Object l)
                      throws EvaluationException

Not implemented for this field.

Parameters:

l - argument

Returns:

null

Throws:

EvaluationException - on error

getOne

public java.lang.Object getOne()

Not defined for this field

Returns:

null

getZero

public java.lang.Object getZero()

Not defined for this field

Returns:

null